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// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
part of dart.core;
* The reserved word [:null:] denotes an object that is the sole instance of
* this class.
* It is a compile-time error for a class to attempt to extend or implement
* Null.
class Null {
factory Null._uninstantiable() {
throw new UnsupportedError('class Null cannot be instantiated');
/** Returns the string `"null"`. */
String toString() => "null";